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Reports any <b>interface</b> that may be annotated as <b>@FunctionalInterface</b>, which is available in JDK 1.8.
Annotating an interface with <b>@FunctionalInterface</b> can be useful to indicate that the interface is supposed to be functional and
further <b>abstract</b> methods should not be added to it.
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<p>This inspection only reports if the language level of the project or module is 8 or higher</p>
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